FURTHER OBSERVATIONS ON HELICOTYLENCHUS VULGARIS YUEN BY YUEN PICK-HOONG Rothamsted Experimental Station, Harpenden, Herts., England 1) The oval-shaped nuclei surrounding the oesophagus and glands and in the ventral hypodermal chord of H. vulgaris seem to be nuclei of the hypodermal cells and not nerve nuclei. The oesophageal glands do not envelop the intestine except perhaps at the oesophago-intestinal junction. Three larval stages of H. vulgaris were found and are best characterised by the structures of the genital primordium which consists of 4 cells in L2, 12 in L3 and 84 in L4. The structure of the genital primordium remained unchanged between moults and the length of the genital primordium did not overlap between stages. Specimens ensheathed in moulted cuticles possess the genital pri- mordium of the next stage. The following study of the development of Helicotylenchu.r vulgaris is con- cerned mainly with the morphology of the larval gonad, which has not been described in any member of the Hoplolaiminae. Other features of the post-em- bryonic development were studied by Golden ( 1956) in Rotyle?achu.r buxophilu.r (Golden) in HelicotylenchuJ microlobus Perry and by Zuckerman & Strich-Harari ( 1 964 ) in H. multicinctus (Cobb). Because van Weerdt ( 1
Nematologica – Brill
Published: Jan 1, 1965
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